Manual

MAX8621Y/MAX8621Z
Dual Step-Down DC-DC Power-Management ICs
for Portable Devices
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 3.7V, C
IN1
= 10µF, C
IN2
= C
IN3
= 4.7µF, C
OUT1
= C
OUT2
= 4.7µF, C
OUT3
= C
OUT4
= 2.2µF, C
REFBP
= 0.01µF, T
A
= -40°C to
+85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Notes 1, 2)
PARAMETER CONDITIONS
MIN TYP MAX
UNIT
Tristate High Input Threshold
Hysteresis
SEL_ 50 mV
PWRON, EN2 Pulldown Resistor
to GND
400 800 1600
kΩ
STEP-DOWN DC-DC CONVERTER 1 (BUCK1)
Supply Current I
LOAD
= 0A, no switching 40 µA
Output Voltage Range 0.6 3.3 V
FB1 Threshold Voltage V
FB1
falling
0.603
V
FB1 Threshold Line Regulation 2.6V ≤ V
IN
≤ 5.5V 0.3 %/V
FB1 Threshold Voltage Hysteresis
(% of V
FB1
)
1%
Shutdown
0.01
FB1 Bias Current
V
FB1
= 0.5V
0.01
µA
p-MOSFET switch (I
LIMP
)
670 1000 1500
Current Limit
n-MOSFET rectifier (I
LIMN
)
750 1000 1330
mA
p-MOSFET switch, I
LX1
= -40mA
0.65
1.5
On-Resistance
n-MOSFET rectifier, I
LX1
= 40mA
0.35
0.8
Ω
Rectifier Off-Current Threshold I
LXOFF
45 70 mA
t
ON
107
Minimum On- and Off-Times
t
OFF
95
ns
STEP-DOWN DC-DC CONVERTER 2 (BUCK2)
Supply Current I
LOAD
= 0A, no switching 40 µA
Output Voltage Range 0.6 3.3 V
FB2 Threshold Voltage V
FB2
falling
0.603
V
FB2 Threshold Line Regulation 2.6V ≤ V
IN
≤ 5.5V 0.3 %/V
FB2 Threshold Voltage Accuracy
(Falling) (% of VFB2)
I
LOAD
= 0A
-2.5 +2.5
%
FB2 Threshold Voltage Hysteresis
(% of VFB2)
1%
Shutdown
0.01
FB2 Bias Current
V
FB
= 0.5V
0.01
µA
p-MOSFET switch
670 1000 1500
Current Limit
n-MOSFET rectifier
750 1000 1330
mA
p-MOSFET switch, I
LX2
= -40mA
0.65
1.5
On-Resistance
n-MOSFET rectifier, I
LX2
= 40mA
0.35
0.8
Ω
Rectifier Off-Current Threshold I
LXOFF
45 70 mA
t
ON
107
Minimum On- and Off-Times
t
OFF
95
ns